It is not permitted the archbishops, bishops, and priests of the kingdom to leave the kingdom without the lord king's permission. And if they do leave they are to give security, if the lord king please, that they will seek no evil or damage to king or kingdom in going, in making their stay, or in returning.

This clause seems to have been lifted [repealed] in Magna Carta 1215

CHAPTER FORTY–TWO. - Misc (Magna Carta), Magna Carta: A Commentary on the Great Charter of King John, with an Historical Introduction [1215]

It shall be lawful in future for any one (excepting always those imprisoned or outlawed in accordance with the law of the kingdom, and natives of any country at war with us, and merchants, who shall be treated as is above provided) to leave our kingdom and to return, safe and secure by land and water, except for a short period in time of war, on grounds of public policy—reserving always the allegiance due to us.

However this clause was omitted from the re-issue of Magna Carta in 1216.

And

In 1352 Edward III. had it proclaimed throughout every county of England that no earl, baron, knight, man of religion, archer, or labourer, should depart the realm under pain of arrest and imprisonment. [Close Roll of 25 Edward III]

Also 25 Hen. VIII (1533/4) c 21 s 14: Nor that any, person religious or other resiant in any the Kynges Domynyons shall fromvhensforth departe out of the Kynges Domynyons to or for any visitacion congregacion or assemble for Re- ligeon, but that all suche visytacyons congregatyons and assembles shal be within the Kynges Domynyons.